French director Julia Ducournau's horror story "Raw" was named best first feature at the festival's black-tie awards ceremony

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This image released by IFC Films shows Lily Gladstone in a scene from "Certain Women." (Jojo Whilden/IFC Films via AP)

Writer-director Kelly Reichardt's spare and subtle Montana drama "Certain Women" won the best-picture prize Saturday at the London Film Festival, while "12 Years a Slave" director Steve McQueen received a major career award.

A jury headed by Greek director Athina Rachel Tsangari praised the masterful imagery and quiet modesty of Reichardt's film about three women — played by Kristen Stewart, Michelle Williams and Laura Dern — struggling with life in a chilly small town.

French director Julia Ducournau's horror story "Raw" was named best first feature during the festival's black-tie awards ceremony at London's 17th-century Banqueting House.

Iranian director Mehrdad Oskouei's portrait of teenage inmates, "Starless Dreams," was named best documentary, and Syrian photographer Issa Touma's "9 Days — From My Window in Aleppo" won the short-film prize.

McQueen, a British director and Turner Prize-winning video artist, was presented with the British Film Institute Fellowship award by actor Michael Fassbender, who has appeared in all three of the director's feature films — "Hunger," ''Shame" and "12 Years a Slave."

When the award was announced last month, BFI chairman Josh Berger said McQueen "has consistently explored the endurance of humanity — even when it is confronted by inhumane cruelty — with a poetry and visual style that he has made his own."

Star Spotting at the Tribeca Film Festival

The 60-year-old London festival has sought this year to encourage diversity in the film industry, opening with Amma Asante's "A United Kingdom." A tale of interracial love and politics inspired by real events, it marked the first time that a black female director has held the prestigious opening slot at the festival.

The 12-day event screened some 250 features, and also included a symposium on why black actors remain under-represented onscreen in Britain and the United States.